UNIX for Dummies Questions & Answers

Hello everybody, i have a big issue, i have to decode a big text in base64 a lot of times but there are 2 problems: i am a noob with unix system and shell, and i have problems with openssl and i can't decode anything. can anyone decode for me that base64? need a powerful computer, i can give some moneys with Paypal to anyone have the patience to decrypt that text for me, it is very important for me.

Thanks to everybody for the next answers,

Best Regards

If you are using Linux/Mac go to a command prompt and enter

Code:

man base64

so something like base64 -d <filename> or
echo "base64texthere" | base64 -d
should work

you've already got a base64 encoder/decoder built in. If it's actually encrypted you'll need a decryption key and run it through openssl and is outside the scope of this answer.

i'm trying with this

Code:

openssl base64 -d -in /Users/Supermarco/Desktop/a.txt -out /Users/Supermarco/Desktop/b.txt

and doesn't work with echo isn't a good idea because the base64 text is very very big

I'm not sure offhand if you can combine the commands in that way.

if what you want to do is decode the base64 and then decrypt the output, you can do something like:

Code:

base64 -d filename.txt > decoded.txt

and then with the decoded.txt work with it in openssl

if it's been encrypted, you'll need a private key to decrypt it which I didn't notice on your command line.

You may be able to combine the two steps together but try and get them sorted one at a time until you at least understand the workflow required before getting fancy and trying to do it all in one shot.

Hope this helps you out.

Oh my GOD! IT WORKS! THANKS YOU VERY MUCH, you are my angel!

Well, now i have solved my first problem... my second problem is that i have to decode the file 1024 times with openssl, i have to build a little script, and for every time i decode it i have to add a word at the last of the text and after i decode it again, this for 1024 times, i have to add AfB21= for every time i decode it, can you build this little script?

Sounds like you are well on your way and today is the perfect time to delve into the fun world of bash script writing!

for me isn't very fun, but... i have tried to do this little script:

Code:

i=0 while (( i++ < 50 )); base64 -d /Users/Supermarco/Desktop/a.txt > /Users/Supermarco/Desktop/b.txt

but it tells me that: -bash: syntax error near unexpected token `('

and without the (()) it decrypt it for me one time only, what i have to put on?

Moderator's Comments:

Please use code tags next time for your code and data. Thanks